This is a slight technicality which the ego forgot to mention.
If you knew and could see that any attempt you make to influence or hurt or affect another, immediately has direct repercussions upon yourself, and that it is absolutely impossible to escape ANY of the effects, then you would have no choice but to always love.
It is ONLY because you do not see, ie are not aware, that this is true, and applies in every situation, that you think it's possible to get away with one set of rules applying to someone else that does not apply to you. Or that you can cause something without experiencing the effects.
The ego is entirely based on this idea that you are not equal to your brother in some way, that they can be the one who is a sinner and not you.
This creates the tremendous illusion, commonly believed-in by most of the planet, that you literally can attack or judge or harm or condemn without having any side effects whatseover.
This is false. It is not true at all.
You could call it karma. It's not pay-back. It's not compensation. It's the simply fact that WHATEVER you do, you WILL do it to yourself and everyone.
"Whatever you do unto the least of my brothers you do unto me" ... or something like that. Every way you treat everyone else, you are treating Jesus and God the same way.
Not necessarily that they will receive the treatment you are dishing out, but you will believe they are.
What applies to others applies to you. At all times.
There are no loopholes. There is no exit clause. There are no workarounds. There is no hope of being especially skilled or capable or clever or imaginative in how you figure out how to cheat the system. The system is not cheatable. God's laws are pemanent.
This is what "shared interests" are all about. You, being literally one with your brother, SHARE everything with them, and therefore receive everything you give.
This is also why giving and receiving are one. What you give you will receive.